Chuck.



A. A. NORTH.

CHUCK.

APPLIOATION FILED JUNE 6, 1907.

932,996, Patented Aug. 31, 1909.

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A. A. NORTH.

CHUCK.

APPLICATION FILED JUNE 6, 1907.

932,996. PatentedAug.31,1909. V

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ALBERT A. NORTH, OF NEW BRITAIN, CONNECTICUT, ASSIGNOR TO THE SKINNERCHUCK GOM- PANY,'0F NEW BRITAIN, CONNECTICUT, A CORPORATION OFCONNECTICUT.

CHUCK.

Specification of Letters Patent.

Application filed June 6, 1907. Serial No. 377,543.

T all whom it may concern:

Be it known that I, ALBERT A. Non'rrr, citizen of the United States ofAmerica, residing at New Britain, in the county of Hartford and State ofConnecticut, have invented certain new and useful Improvements inChucks, of which the following is a specification.

My invention relates to the class of lathe chucks, and more especiallyto the devices included in such class known as independent chucks, orone in which the jaws are operated independently each of the other.

The object of my invention is to provide a construction of chuck inwhich the feedscrew shall not be inadvertently dislodged; and a furtherobject of the invention is to provide a construction for retaining thefeed-screw in its bearing that shall be simple in construction andefficient in its method of operation.

A form of device in the use of which these objects may be attained isillustrated in the accompanying drawings in which Figure l is a faceview of a lathe chuck embodying my invention with parts broken away toshow construction. Fig. 2 is a view in section through the chuck on theline l-1. Fig. 3 is a face view of a portion of a chuck illustratinganother form of the invention, parts being broken away to showconstruction. Fig. 4 is a view in section through the chuck lookingtoward the retainer.

In the accompanying drawings the numeral 5 denotes a chuck body havingradial grooves 6. This body, in the usual form of construction, is madeof metal cast to shape. A bearing 7 is formed integral with the body ofthe chuck extending across the groove 6 and in this bearing a feed-screw8 is supported. The feed-screw is cut away to provide a neck 9 formingthe bearing thereof.

Chuck jaws 10 are located in the grooves 6. Ribs 11 oppositely arrangedon the walls of the grooves enter slots 12 in the chuck jaws and form ameans for holding the parts in engagement while allowing the jaws alongitudinal reciprocation within the grooves. The under side of thejaws are threaded to fit the threads on the feedscrews and the latterbeing held against lengthwise movement by the peculiar formation of thehearing, as a feed-screw is turned the nut on a jaw appurtenant theretocauses the jaw to be moved radially of the chuck body.

The form of construction just described is old and well known, and thechuck body is also provided with other parts incidental to itsoperation, the construction and operation of which are well known, andfor this reason further and detailed description thereof is omitted.

In order to obtain a suficient extent of engaging surface between thefeed-screw and a chuck jaw the bearing 7 and neck 9 are comparativelyshort. This construction however results in a lifting of the feedscrewfrom its hearing when the chuck jaw is located at a distance from thebearing and is turned in a certain direction. In replacing thefeed-screw the corners of the castiron bearing 7 are liable to bechipped and broken, thus injuring and in many cases clestroying suchbearing, which, however, but for such defect, is the desirable form ofconstruction owing to its cheapness. In cases of such injury it isnecessary to drill out the bearing and insert a separate piece whichmust then be cut to form a bearing. It therefore becomes essential thatthis lifting of the feed-screw from its bearing shall be prevented andthe means herein shown of fectually accomplishes this result by theemployment of a construction which at the same time involves a minimumcost. In carrying out this idea I provide a retainer groove extendingcircumferentially about the wall of the central opening 21 through thechuck body. This groove is of a width to receive and hold a retainer 22which is curved on the arc of the circle constituting the opening 21. Ahole 23 is formed through the retainer and this hole is counterbored forthe reception of the head of a retainingscrew 24. This retaining-screwis threaded into an opening in the end of the feed-screw 8, theretaining-screw seating against the end of the feed-screw as plainlyshown in Fig. 1 of the drawings.

In the form of the device illustrated in Figs. 3 and 4 instead ofemploying a single retainer for each feed-screw a retainer for holding aplural number of feed-screws is Patented Aug. 31, 1909.

recess 31. A retaining screw is passed into the chuck to hold theretainer in place,

preferably engaging with this oli'set portion 32 thus holding theretainer securely within the groove 30. Slots 3% are formed in theretainers, these slots being adapted to receive pins which are formed aspart of or secured within the feed-screw S. This method of retaining thefeed-screws in place is much the same as that first above de scribed,and in both instances it will be seen that while the bearing 7 may beconstructed integral with the chuck body, yet at the same time thefeed-screw is eilectually retained in position.

I contemplate as within the scope of the invention other IHGttDS ofholding the feedscrew in place within a bearing integrally formed withthe chuck body, but for the purposes of this application I have deemedthe forms herein described as being sufficient.

hat I claim as my invention and desire to secure by Letters Patent 1s:

1. A chuck body having a radially formed 1 groove and a central openingwith aretainer groove, a jaw slidable in said groove, a feedscrewlocated within the groove and operatively engaging the jaw, a feed-screwbearing integrally formed with the chuck body, a retainer located withinthe retainer groove, and means from said retainer engaging thefeed-screw to hold it in its bearing.

2. A chuck body having a radially formed groove and a central openinghaving a retainer groove, a chuck jaw slid-able in said groove, afeed-screw located within the groove and operatively engaging said chuckjaw, a feed-screw bearing integrally formed in the chuck body, aretainer reniovably secured within said retainer groove, and a screwloosely mounted in the retainer and secured within the end of saidfeed-screw.

Intestiniony whereof I my signature in presence of two witnesses.

ALBERT A. NORTH. lVitnesses BENJ. F. Damon, E. J. SKINNER.

